<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <ul>
      <li v-for="item in list">{{item}}</li>
    </ul>
    <button @click="fn">走一走</button>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    // 3. 创建Vue实例
    const app = new Vue({
      el: '#app',
      data: {
        list: ['帅哥', '美女', '程序员']
      },
      methods: {
        fn() {
         /*  const num = this.list[0]
          arr = this.list.splice(0, 1)
          this.list.push(num) */


          this.list.push(this.list.shift())
        }
      }
    })
  </script>
</body>

</html>